En Route Noise Levels From Propfan Test Assessment Airplane PDF Download
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Author | : Donald P. Garber |
Publisher | : |
Total Pages | : 36 |
Release | : 1994 |
Genre | : Airplanes |
ISBN | : |
Download En Route Noise Levels from Propfan Test Assessment Airplane Book in PDF, ePub and Kindle
Author | : National Aeronautics and Space Administration (NASA) |
Publisher | : Createspace Independent Publishing Platform |
Total Pages | : 32 |
Release | : 2018-07-02 |
Genre | : |
ISBN | : 9781722202309 |
Download En Route Noise Levels from Propfan Test Assessment Airplane Book in PDF, ePub and Kindle
The en route noise test was designed to characterize propagation of propfan noise from cruise altitudes to the ground. In-flight measurements of propfan source levels and directional patterns were made by a chase plane flying in formation with the propfan test assessment (PTA) airplane. Ground noise measurements were taken during repeated flights over a distributed microphone array. The microphone array on the ground was used to provide ensemble-averaged estimates of mean flyover noise levels, establish confidence limits for those means, and measure propagation-induced noise variability. Even for identical nominal cruise conditions, peak sound levels for individual overflights varied substantially about the average, particularly when overflights were performed on different days. Large day-to-day variations in peak level measurements appeared to be caused by large day-to-day differences in propagation conditions and tended to obscure small variations arising from operating conditions. A parametric evaluation of the sensitivity of this prediction method to weather measurement and source level uncertainties was also performed. In general, predictions showed good agreement with measurements. However, the method was unable to predict short-term variability of ensemble-averaged data within individual overflights. Although variations in absorption appear to be the dominant factor in variations of peak sound levels recorded on the ground, accurate predictions of those levels require that a complete description of operational conditions be taken into account. The comprehensive and integrated methods presented in this paper have adequately predicted ground-measured sound levels. On average, peak sound levels were predicted within 3 dB for each of the three different cruise conditions. Garber, Donald P. and Willshire, William L., Jr. Langley Research Center RTOP 535-03-11-02...
Author | : Richard P. Woodward |
Publisher | : |
Total Pages | : 161 |
Release | : 1993 |
Genre | : Airplanes |
ISBN | : |
Download In-flight Near- and Far-field Acoustic Data Measured on the Propfan Test Assessment (PTA) Testbed and with an Adjacent Aircraft Book in PDF, ePub and Kindle
Author | : David A. McCurdy |
Publisher | : |
Total Pages | : 44 |
Release | : 1992 |
Genre | : Aerodynamic noise |
ISBN | : |
Download Annoyance Caused by Aircraft en Route Noise Book in PDF, ePub and Kindle
Author | : National Aeronautics and Space Administration (NASA) |
Publisher | : Createspace Independent Publishing Platform |
Total Pages | : 62 |
Release | : 2018-07-16 |
Genre | : |
ISBN | : 9781722779801 |
Download Structure-Borne Noise Estimates for the PTA Aircraft Book in PDF, ePub and Kindle
Estimates of the level of in-flight structure-borne noise transmission in the Propfan Test Assessment Aircraft were carried out for the first three blade passage frequencies. The procedure used combined the frequency response functions of wing strain to cabin sound pressure level (SPL) response obtained during ground test with in-flight measured wing strain response data. The estimated cabin average in-flight structure-borne noise levels varied from 64 to 84 dB, with an average level of 74 dB. The estimates showed little dependence on engine/propeller power, flight altitude, or flight Mach number. In general, the bare cabin noise levels decreased with increasing propeller tone, giving rise to a plausible structure-borne noise transmission problem at the higher blade passage tones. Without knowledge of the effects of a high insertion loss side wall treatment on structure-borne noise transmission, no quantitative conclusions could be made. Unruh, James F. Unspecified Center...
Author | : |
Publisher | : |
Total Pages | : 884 |
Release | : 1990 |
Genre | : Airplanes |
ISBN | : |
Download FAA/NASA En Route Noise Symposium Book in PDF, ePub and Kindle
Author | : H.L. Kuntz |
Publisher | : |
Total Pages | : |
Release | : 1989 |
Genre | : |
ISBN | : |
Download Interior Noise in the Untreated Gulfstream II Propfan Test Assessment (PTA) Aircraft Book in PDF, ePub and Kindle
Author | : |
Publisher | : |
Total Pages | : 1450 |
Release | : |
Genre | : Government publications |
ISBN | : |
Download Monthly Catalog of United States Government Publications Book in PDF, ePub and Kindle
Author | : |
Publisher | : |
Total Pages | : 492 |
Release | : 1994 |
Genre | : Aeronautics |
ISBN | : |
Download NASA Technical Memorandum Book in PDF, ePub and Kindle
Author | : |
Publisher | : |
Total Pages | : 300 |
Release | : 1995 |
Genre | : Aeronautics |
ISBN | : |
Download Scientific and Technical Aerospace Reports Book in PDF, ePub and Kindle